/*
 *---------------------------------------------------------------
 *                        Lvgl Font Tool
 *
 * 注:使用unicode编码
 * 注:本字体文件由Lvgl Font Tool V0.4 生成
 * 作者:阿里(qq:617622104)
 *---------------------------------------------------------------
 */

#include "lvgl.h"

/* 使用说明 :
 * 1、利用外部存储介质导入字库至 SPI-Flash (只需要做一次, ROM 掉电不丢失)
 * 2、将 SPI-Flash 内的字库拷贝到 SDRAM , 并对 <lv_font_t> demo_font 赋值(每次复位上电都需要做, RAM 掉电丢失)
 * 3、依赖 <lv_font_t> demo_font 字体源设置字体样式, 并赋予对应对象生效, 样式设置有如下两种方式 :
 *
 * eg 针对 LVGL-V7.11 , 对于其他 LVGL 版本原理类似, API 则不尽相同.
 *
 * <1> 全局样式
 * lv_style_set_text_font(style_obj, LV_STATE_DEFAULT, &demo_font);(注意 : style_obj 须要提前完成各字段的初始化赋值 lv_style_init(style_obj);)
 * lv_obj_add_style(label, LV_LABEL_PART_MAIN, style_label); //将字体样式赋予对应的对象
 *
 * <2> 本地样式
 * lv_obj_set_style_local_text_font(obj, LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, &demo_font);
 */

uint32_t Demo_Font_Addr = 0;

typedef struct{
    uint16_t min;
    uint16_t max;
    uint8_t  bpp;
    uint8_t  reserved[3];
}x_header_t;
typedef struct{
    uint32_t pos;
}x_table_t;
typedef struct{
    uint8_t adv_w;
    uint8_t box_w;
    uint8_t box_h;
    int8_t  ofs_x;
    int8_t  ofs_y;
    uint8_t r;
}glyph_dsc_t;


static x_header_t __g_xbf_hd = {
    .min = 0x0020,
    .max = 0x96c6,
    .bpp = 4,
};

//#include "FlashDisk.h"
//static uint8_t __g_font_buf[231];//如bin文件存在SPI FLASH可使用此buff

static uint8_t *__user_font_getdata(int offset, int size){
    //如字模保存在SPI FLASH, SPIFLASH_Read(__g_font_buf,offset,size);
    //FlashDiskRead(字库起始存放的绝对地址(挂载文件系统时无法获知, 仅能通过 f_read) + offset, size, __g_font_buf);
    //return __g_font_buf;

    //如字模已加载到SDRAM,直接返回偏移地址即可如:return (uint8_t*)(sdram_fontddr+offset);
    return (uint8_t*)(Demo_Font_Addr + offset);
}


static const uint8_t * __user_font_get_bitmap(const lv_font_t * font, uint32_t unicode_letter) {
    if( unicode_letter>__g_xbf_hd.max || unicode_letter<__g_xbf_hd.min ) {
        return NULL;
    }
    uint32_t unicode_offset = sizeof(x_header_t)+(unicode_letter-__g_xbf_hd.min)*4;
    uint32_t *p_pos = (uint32_t *)__user_font_getdata(unicode_offset, 4);
    if( p_pos[0] != 0 ) {
        uint32_t pos = p_pos[0];
        glyph_dsc_t * gdsc = (glyph_dsc_t*)__user_font_getdata(pos, sizeof(glyph_dsc_t));
        return __user_font_getdata(pos+sizeof(glyph_dsc_t), gdsc->box_w*gdsc->box_h*__g_xbf_hd.bpp/8);
    }
    return NULL;
}


static bool __user_font_get_glyph_dsc(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out, uint32_t unicode_letter, uint32_t unicode_letter_next) {
    if( unicode_letter>__g_xbf_hd.max || unicode_letter<__g_xbf_hd.min ) {
        return NULL;
    }
    uint32_t unicode_offset = sizeof(x_header_t)+(unicode_letter-__g_xbf_hd.min)*4;
    uint32_t *p_pos = (uint32_t *)__user_font_getdata(unicode_offset, 4);
    if( p_pos[0] != 0 ) {
        glyph_dsc_t * gdsc = (glyph_dsc_t*)__user_font_getdata(p_pos[0], sizeof(glyph_dsc_t));
        dsc_out->adv_w = gdsc->adv_w;
        dsc_out->box_h = gdsc->box_h;
        dsc_out->box_w = gdsc->box_w;
        dsc_out->ofs_x = gdsc->ofs_x;
        dsc_out->ofs_y = gdsc->ofs_y;
        dsc_out->bpp   = __g_xbf_hd.bpp;
        return true;
    }
    return false;
}


//宋体,Regular,16
//字模高度：21
//XBF字体,外部bin文件
lv_font_t demo_font = {
    .get_glyph_bitmap = __user_font_get_bitmap,
    .get_glyph_dsc = __user_font_get_glyph_dsc,
    .line_height = 21,
    .base_line = 0,
};
